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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6008b6fcc1e4d778838989353e8d9d589fea36371ffe7bf72c3091be163a568b' 
  AND token = 'o/TeYluNHevofD4KNjgC33XeJDDHbQcqxGfLZF0ft6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}